kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
217 wiersze
7.6 KiB
Python
217 wiersze
7.6 KiB
Python
# NanoVNASaver
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#
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# A python program to view and export Touchstone data from a NanoVNA
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# Copyright (C) 2019, 2020 Rune B. Broberg
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# Copyright (C) 2020 NanoVNA-Saver Authors
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import logging
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import platform
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from struct import pack, unpack_from
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from time import sleep
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from typing import List
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from NanoVNASaver.Hardware.Serial import Interface
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from NanoVNASaver.Hardware.VNA import VNA
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from NanoVNASaver.Version import Version
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if platform.system() != 'Windows':
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import tty
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logger = logging.getLogger(__name__)
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_CMD_NOP = 0x00
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_CMD_INDICATE = 0x0d
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_CMD_READ = 0x10
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_CMD_READ2 = 0x11
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_CMD_READ4 = 0x12
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_CMD_READFIFO = 0x18
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_CMD_WRITE = 0x20
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_CMD_WRITE2 = 0x21
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_CMD_WRITE4 = 0x22
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_CMD_WRITE8 = 0x23
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_CMD_WRITEFIFO = 0x28
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_ADDR_SWEEP_START = 0x00
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_ADDR_SWEEP_STEP = 0x10
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_ADDR_SWEEP_POINTS = 0x20
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_ADDR_SWEEP_VALS_PER_FREQ = 0x22
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_ADDR_RAW_SAMPLES_MODE = 0x26
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_ADDR_VALUES_FIFO = 0x30
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_ADDR_DEVICE_VARIANT = 0xf0
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_ADDR_PROTOCOL_VERSION = 0xf1
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_ADDR_HARDWARE_REVISION = 0xf2
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_ADDR_FW_MAJOR = 0xf3
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_ADDR_FW_MINOR = 0xf4
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WRITE_SLEEP = 0.05
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class NanoVNA_V2(VNA):
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name = "NanoVNA-V2"
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valid_datapoints = (101, 10, 50, 202, 303, 505, 1023)
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screenwidth = 320
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screenheight = 240
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def __init__(self, iface: Interface):
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super().__init__(iface)
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if platform.system() != 'Windows':
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tty.setraw(self.serial.fd)
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# reset protocol to known state
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with self.serial.lock:
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self.serial.write(pack("<Q", 0))
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sleep(WRITE_SLEEP)
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self.version = self.readVersion()
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self.firmware = self.readFirmware()
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# firmware major version of 0xff indicates dfu mode
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if self.firmware.data["major"] == 0xff:
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raise IOError('Device is in DFU mode')
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self.sweepStartHz = 200e6
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self.sweepStepHz = 1e6
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self._sweepdata = []
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self._updateSweep()
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def getCalibration(self) -> str:
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return "Unknown"
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def read_features(self):
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self.features.add("Customizable data points")
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# TODO: more than one dp per freq
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self.features.add("Multi data points")
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def readFirmware(self) -> str:
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# read register 0xf3 and 0xf4 (firmware major and minor version)
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cmd = pack("<BBBB",
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_CMD_READ, _ADDR_FW_MAJOR,
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_CMD_READ, _ADDR_FW_MINOR)
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with self.serial.lock:
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self.serial.write(cmd)
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sleep(WRITE_SLEEP)
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resp = self.serial.read(2)
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if len(resp) != 2:
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logger.error("Timeout reading version registers")
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return None
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return Version(f"{resp[0]}.{resp[1]}.0")
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def readFrequencies(self) -> List[int]:
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return [
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int(self.sweepStartHz + i * self.sweepStepHz)
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for i in range(self.datapoints)]
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def readValues(self, value) -> List[str]:
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# Actually grab the data only when requesting channel 0.
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# The hardware will return all channels which we will store.
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if value == "data 0":
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# reset protocol to known state
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timeout = self.serial.timeout
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with self.serial.lock:
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self.serial.write(pack("<Q", 0))
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sleep(WRITE_SLEEP)
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# cmd: write register 0x30 to clear FIFO
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self.serial.write(pack("<BBB",
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_CMD_WRITE, _ADDR_VALUES_FIFO, 0))
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sleep(WRITE_SLEEP)
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# clear sweepdata
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self._sweepdata = [(complex(), complex())] * self.datapoints
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pointstodo = self.datapoints
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# 8 seconds should be enough for 8k points
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self.serial.timeout = min(8.0, (pointstodo / 32) + 0.1)
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while pointstodo > 0:
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logger.info("reading values")
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pointstoread = min(255, pointstodo)
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# cmd: read FIFO, addr 0x30
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self.serial.write(
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pack("<BBB",
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_CMD_READFIFO, _ADDR_VALUES_FIFO,
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pointstoread))
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sleep(WRITE_SLEEP)
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# each value is 32 bytes
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nBytes = pointstoread * 32
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# serial .read() will wait for exactly nBytes bytes
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arr = self.serial.read(nBytes)
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if nBytes != len(arr):
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logger.error("expected %d bytes, got %d",
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nBytes, len(arr))
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return []
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freq_index = -1
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for i in range(pointstoread):
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(fwd_real, fwd_imag, rev0_real, rev0_imag, rev1_real,
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rev1_imag, freq_index) = unpack_from(
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"<iiiiiihxxxxxx", arr, i * 32)
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fwd = complex(fwd_real, fwd_imag)
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refl = complex(rev0_real, rev0_imag)
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thru = complex(rev1_real, rev1_imag)
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if i == 0:
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logger.debug("Freq index from: %i", freq_index)
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self._sweepdata[freq_index] = (refl / fwd, thru / fwd)
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logger.debug("Freq index to: %i", freq_index)
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pointstodo = pointstodo - pointstoread
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self.serial.timeout = timeout
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ret = [x[0] for x in self._sweepdata]
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ret = [str(x.real) + ' ' + str(x.imag) for x in ret]
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return ret
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if value == "data 1":
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ret = [x[1] for x in self._sweepdata]
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ret = [str(x.real) + ' ' + str(x.imag) for x in ret]
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return ret
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def resetSweep(self, start: int, stop: int):
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self.setSweep(start, stop)
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# returns device variant
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def readVersion(self) -> 'Version':
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# read register 0xf0 (device type), 0xf2 (board revision)
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cmd = b"\x10\xf0\x10\xf2"
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with self.serial.lock:
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self.serial.write(cmd)
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sleep(WRITE_SLEEP)
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resp = self.serial.read(2)
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if len(resp) != 2:
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logger.error("Timeout reading version registers")
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return None
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return Version(f"{resp[0]}.0.{resp[1]}")
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def setSweep(self, start, stop):
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step = (stop - start) / (self.datapoints - 1)
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if start == self.sweepStartHz and step == self.sweepStepHz:
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return
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self.sweepStartHz = start
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self.sweepStepHz = step
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logger.info('NanoVNAV2: set sweep start %d step %d',
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self.sweepStartHz, self.sweepStepHz)
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self._updateSweep()
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return
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def _updateSweep(self):
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cmd = pack("<BBQ", _CMD_WRITE8,
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_ADDR_SWEEP_START, int(self.sweepStartHz))
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cmd += pack("<BBQ", _CMD_WRITE8,
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_ADDR_SWEEP_STEP, int(self.sweepStepHz))
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cmd += pack("<BBH", _CMD_WRITE2,
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_ADDR_SWEEP_POINTS, self.datapoints)
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cmd += pack("<BBH", _CMD_WRITE2,
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_ADDR_SWEEP_VALS_PER_FREQ, 1)
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with self.serial.lock:
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self.serial.write(cmd)
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sleep(WRITE_SLEEP)
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